There are 72 pupils taking part in an international mathematic competition. 4 9 of the pupils are girls. How many boys are there?

Answer 1

To find out how many boys there are, we first need to figure out how many girls there are since we are given that \( \frac{4}{9} \) of the pupils are girls.

There are 72 pupils in total and \( \frac{4}{9} \) of these pupils are girls. To find out the number of girls, we can multiply the total number of pupils by \( \frac{4}{9} \):

Number of girls = \( 72 \times \frac{4}{9} \)

Now let's do the calculation:

Number of girls = \( 8 \times 4 \) (since \( 72 ÷ 9 = 8 \))

Number of girls = 32

Now that we know how many girls there are, we can subtract this number from the total number of pupils to find out how many boys there are:

Number of boys = Total number of pupils - Number of girls

Number of boys = 72 - 32

Number of boys = 40

So, there are 40 boys in the international mathematic competition.